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Employee Benefit Plans - Overview (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jul. 02, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplemental Individual Account Retirement Plan (SIARP) |  |  |  |  |
Employee benefit plans |  |  |  |  |
Percentage of projected benefit obligation that was settled |  | 22.00% |  |  |
Settlements |  | $ 2.7 |  |  |
Charge to net periodic pension benefit expense |  |  |  |  | $ 0.8
United States |  |  |  |  |
Employee benefit plans |  |  |  |  |
Settlements |  |  | $ 11.1 | $ 0.0 |
Plan amendment |  |  | $ 0.0 | $ 0.0 |
United States | SPX Flow, Inc | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |  |
Employee benefit plans |  |  |  |  |
Percentage of projected benefit obligation that was settled |  | 9.00% |  |  |
Settlements |  | $ 25.2 |  |  |
Charge to net periodic pension benefit expense |  |  |  |  | $ 1.0
U.S. Postretirement Plan (“OPEB”) |  |  |  |  |
Employee benefit plans |  |  |  |  |
Plan amendment | $ (26.8) |  |  |  |
(Increase) decrease for remeasurement due to settlement | $ 2.6 |  |  |  |

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